Intramuscular injection forms of gyrase inhibitors
This application is a continuation, of application Ser. No. 334,252, filed Apr. 6, 1989. 
    
    
     The invention relates to intramuscular injection forms which contain, as the active compound, gyrase inhibitors from the group comprising quinolone- and 1,8-naphthyridone-3-carboxylic acids, their preparation and their use as medicaments. 
     Tablets for peroral administration and relatively large volume infusion solutions (0.2% strength/50, 100 ml) and infusion concentrates (1% strength/10 ml) containing, for example, ciprofloxacin as the active substance have so far been available. In contrast, no satisfactory formulation has to date been developed for intramuscular administration. Solutions of, for example, ciprofloxacin of up to 5% strength for intramuscular administration are thus very poorly tolerated because of their non-physiological pH in the acid or alkaline range. After intramuscular injection of aqueous acid or alkaline solutions, considerable intolerances and damage up to necroses have been found in the muscular tissue. 
     Surprisingly, it has now been found that ciprofloxacin is tolerated well following intramuscular administration if it is administered in the form of an aqueous suspension of the betaine form having an approximate neutral pH value or in the form of an oily suspension of the betaine or salts thereof. Moreover it has been found surprisingly that oily suspensions which contain ciprofloxacin in water-soluble form, eventually in form of the hydrochlorides, lactates, mesilates, methanesulfonates and other salts, are capable of releasing the active compound very rapidly, particularly when the wettability of the oily carrier medium is increased by addition of interfacially surface active materials. To the contrary aqueous suspensions which contain the active compound in the form of betaine ensure protracted release of the active compound. 
     Regulation and control of release of the active compound is possible via choice of particle size and the combination of auxiliaries respectively. 
     The invention relates to intramuscular injection formulations of gyrase inhibitors containing 0.05 to 70% by weight of a gyrase inhibitor of the general formula ##STR1## in which R 1  stands for methyl, ethyl, propyl, isopropyl, cyclopropyl, vinyl, 2-hydroxyethyl, 2-fluoroethyl, methoxy, amino, methylamino, dimethylamino, ethylamino, phenyl, 4-fluorophenyl or 2,4-difluorophenyl, 
     R 2  stands for hydrogen, alkyl having 1 to 4 carbon atoms or (5-methyl-2-oxo-1,3-dioxol-4-yl)-methyl, 
     R 3  stands for methyl or a cyclic amino group, such as ##STR2##  wherein R 4  stands for hydrogen, alkyl having 1 to 4 carbon atoms, 2-hydroxyethyl, allyl, propargyl, 2-oxopropyl, 3-oxobutyl, phenacyl, formyl, CFCl 2  -S-, CFCl 2  -SO 2  -, CH 3  O-CO-S-, benzyl, 4-aminobenzyl or ##STR3## R 5  stands for hydrogen or methyl, R 6  stands for hydrogen, alkyl having 1 to 4 carbon atoms, phenyl or benzyloxymethyl, 
     R 7  stands for hydrogen, amino, methylamino, ethylamino, aminomethyl, methylaminomethyl, ethylaminomethyl, dimethylaminomethyl, hydroxyl or hydroxymethyl and 
     R 8  stands for hydrogen, methyl, ethyl or chlorine, 
     X stands for fluorine, chlorine or nitro and 
     A stands for N or C-R 6 , 
     wherein 
     R 6  stands for hydrogen, halogen, such as fluorine or chlorine, methyl or nitro or, together with 
     R 1 , can also form a bridge having the structure ##STR4##  if appropriate as a salt with an acid or base or as a pro-drug, in aqueous or oily suspension. 
     Not only a systemic action, which can be controlled with respect to time, depending on the composition of the formulation, can be achieved with the intramuscular injections containing gyrase inhibitors. In addition, local infection foci can also be reached by the direct route and treated in a targeted manner over relatively long periods of time. 
     The gyrase inhibitors can be used in the aqueous and oily injection forms as such or as a salt with an acid or base. It is also possible to use them as a prodrug, for example in the form of esters. 
     The formulations according to the invention contain 0.05-70% by weight, preferably 2.5-50% by weight, of the active compound. 
     The suspensions according to the invention for intramuscular injection particularly preferably contain 10-60% weight/weight of the active compound of the above formula. 
     The formulations mentioned contain, in particular, ciprofloxacin, norfloxacin, pefloxacin, amifloxacin, pirfloxacin, ofloxacin, fleroxacin, lomefloxacin and/or enoxacin. The formulations according to the invention especially preferably also contain the active compounds of European Patent Applications 153,163, 106,489, 153,828, 195,316, 167,763 and 126,355. 
     The following active compounds may be mentioned in particular: 6-chloro-7-[3-(4-chlorophenyl)-1-piperazinyl]-1-cyclopropyl-8-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 6-chloro-1-cyclopropyl-8-fluoro-7-[3-(4-fluorophenyl)-1-piperazinyl]-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 7-[3-(4-bromophenyl)-1-piperazinyl]-6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-7-[3-(4-methylphenyl)-1-piperazinyl]-4-oxo-3-quinolinecarboxylic acid, 7-[3-(4-biphenylyl)-1-piperazinyl]-6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-7-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-3-quinolinecarboxylic acid, 6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-7-[3-(4-hydroxyphenyl)-1-piperazinyl]-4-oxo-3-quinolinecarboxylic acid, 8-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(3-phenyl-1-piperazinyl)-3-quinolinecarboxylic acid, 8 -chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-[(4-nitrophenyl)-1-piperazinyl]-3-quinolinecarboxylic acid, 8-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-[3-(4-piperidinophenyl)-1-piperazinyl]-3-quinolinecarboxylic acid, 8-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-8-[3-(3,4-dimethoxyphenyl)-1-piperazinyl]-3-quinolinecarboxylic acid, 8-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-[3-(3,4,5-trimethoxyphenyl)-1-piperazinyl]-3-quinolinecarboxylic acid, 8-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-[3-(2-thienyl)-1-piperazinyl]- 3-quinolinecarboxylic acid, 8-chloro-1-cyclopropyl,6-fluoro-1,4-dihydro-4-oxo-7-piperidino-3-quinolinecarboxylic acid, 7-(3-amino-1-pyrrolidinyl)-8-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid (active compound B), 6,8-dichloro-1-cyclopropyl-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid, 7-(4-acetyl-1-piperazinyl)-6,8-dichloro-1-cyclopropyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 7-(4-acetyl-1-piperazinyl)-6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-7-(4-isopropyl-1-piperazinyl)-4-oxo-3-quinolinecarboxylic acid, 6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-4-oxo-7-morpholino-3-quinolinecarboxylic acid, 6-chloro-1-cyclopropyl-8-fluoro-1,4-dihydro-4-oxo-7-thiomorpholino-3-quinolinecarboxylic acid, 8-chloro-1-cyclopropyl-7-(4-ethyl-3-oxo-1-piperazinyl)-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(4-methyl- 1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(4-ethyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3-methyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3,4-dimethyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(4-ethyl-3-methyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-[4-(2-hydroxyethyl)-3-methyl-1-piperazinyl]-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-[4-(3-hydroxypropyl)-3-methyl-1-piperazinyl]-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(2,5-dimethyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(4-ethyl-2,5-dimethyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3,5-dimethyl-1-piperazinyl)-3-quinolinecarboxylic acid (active compound A), 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3,4,5-trimethyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(4-ethyl-3,5-dimethyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3-ethyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3-n-propyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3-aminopyrrolidinyl)-3-quinolinecarboxylic acid (active compound C), 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3-isopropyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3-isobutyl-1-pipereazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-(3-methyl-4-n-propyl-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3-methyl-4-isopropyl)-1-piperazinyl)-3-quinolinecarboxylic acid, 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7 -(4-n-butyl-3-methyl-1-piperazinyl)-3-quinolinecarboxylic acid and 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-morpholinyl-3-quinolinecarboxylic acid, and their pharmaceutically usable acid addition salts, alkali metal salts, alkaline earth metal salts or hydrates. 
     Finally, ciprofloxacin or enrofloxacin are also particularly preferably employed as the active compound in the formulations according to the invention. 
     In addition to water for injection purposes, aqueous suspensions for intramuscular injection can furthermore also contain as the liquid excipient, for example, ethanol, glycerol, propylene glycol, polyethylene glycol and triethylene glycol. Various substances such as phosphate, citrate, tris, ascorbate, acetate, succinate, tartrate, gluconate and lactate buffers can be used for adjusting the pH as far as possible to within the physiological range of about pH 7.4 or for buffering. The pH of the aqueous formulations according to the invention is 4.5-8.5, preferably 6.5-7.5. The osmolality of the aqueous suspensions is 200-900 m osmol/kg, preferably 260-390 m osmol/kg, and can be adjusted to suit isotonic conditions by additions of NaCl, glucose, fructose, glycerol, sorbitol, mannitol, sucrose or xylitol or mixtures of these substances. 
     It is moreover possible to use other formulating agents, such as thickeners (for example methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, sodium carboxymethylcellulose, polyvinylpyrrolidone, gelatine and the like), absorption agents, light screens, absorption inhibitors, crystallization retarders, complexing agents (for example NaEDTA, phosphates, nitrates, acetates, citrates and others), antioxidants (ascorbic acid, sulphite compounds, L-cysteine, thiodipropionic acid, thiolactic acid, monothioglycerol, propyl gallate and others) and preservatives (PHB esters, phenol and derivatives, organomercury compounds, chlorobutanol, benzyl alcohol, ethanol, 1,3-butanediol, benzalkonium chloride, chlorhexidine salts, benzoic acid and salts, sorbic acid and others). Local anaesthetics, such as, for example, procaine HCl, lidocaine HCl and others, can be added to the aqueous suspensions if appropriate. 
     When preparing the aqueous suspensions, it must be ensured that the particle size is 0.5-50 μm, in particular 4-40 μm. Control of the release of active compound from the intramuscular suspension depot can be achieved by controlled mixing of different particle size classes of the active substance. 
     In the case of aqueous suspensions, the particle sizes of 90% of the particles are preferably 10-20 μm. The viscosity of the aqueous suspensions is 5-500 mPa.s, preferably 10-130 mPa.s. 
     Aqueous suspensions of gyrase inhibitors can be prepared in various ways. On the one hand, the active compounds from the gyrase inhibitor class can be incorporated in micronized form into the aqueous excipient medium, the auxiliaries mentioned being included; in this procedure, it should strictly be ensured that no crystal growth occurs beyond the limits mentioned. If appropriate, the active compound must be prepared in the form of one of its stable hydrate stages and further processed to a suspension. If final sterilization by heat is not possible, manufacture must be carried out under aseptic conditions using pretreated active compounds and auxiliaries. Final sterilization, as by radiation is possible. 
     Aqueous suspensions of gyrase inhibitors of the quinolone type can moreover be prepared by controlled precipitation from a solution; there is the possibility, for example, of dissolving the active compound in a physiologically tolerated acid from the group consisting of hydrochloric acid, methanesulphonic acid, propionic acid, succinic acid, glutaric acid, citric acid, fumaric acid, maleic acid, tartaric acid, glutamic acid, gluconic acid, glucuronic acid, galacturonic acid, ascorbic acid, phosphoric acid, adipic acid, hydroxyacetic acid, sulphuric acid, nitric acid, acetic acid, malic acid, L-aspartic acid, lactic acid, isethionic acid, lactobionic acid and oxatic acid or in amino acids from the group consisting of L-Arginine, L-Aspartic, L-Cysteic, L-Glutamic, Glycine, L-Leucine, L-Lysine and L-Serine, if appropriate while warming slightly, preferably to 20°-80° C. 
     An excess of acid is preferably used, for example in accordance with the doctrine of European Patent Applications 86 114 131.5 and 84 110 474.8. The acid solution is then adjusted to the physiological pH of 7 by addition of a physiologically tolerated alkaline solution, for example of sodium hydroxide, potassium hydroxide or meglumine, the active compound being precipitated out of the solution in finely divided form. On the other hand, there is also the possibility of dissolving the active compound of the quinolone/naphthyridone gyrase inhibitor type in an alkaline medium using one of the bases mentioned and then to precipitate it by one of the acids mentioned. 
     However, the acids and alkaline solutions can be combined without using pressure, but also with pressure, in a range from 2 to 100 bar, it being possible to control the resulting particle size in the suspension via the preparation conditions defined. The actual precipitation operation can also be followed by additional homogenization using high-speed stirrers, rotor-stator homogenizers, high pressure homogenizers (100-1000 bar) and similar methods. If final sterilization is prohibited because of possible particle growth, the suspension is to be prepared under aseptic conditions by combining sterilized and sterile-filtered acid and basic part components with one another under strictly aseptic conditions. If appropriate, one of the preservatives mentioned or a combination thereof can be employed in a suitable dosage in order to guarantee a germ-free preparation. Final sterilization in form of a γ-ray sterilization may be applied too. 
     A presentation form which contains the active compound in a dry form without a liquid excipient can moreover be provided. The separate liquid excipient is combined with the solids content of the recipe only shortly before administration, in which case homogeneous distribution of the solids particles in the liquid phase must be guaranteed by brief shaking. 
     Under the provisions set forth hereinabove and hereinbelow there are particularly preferred oil based intramuscular injection formulations which contain the active compound in water-soluble, crystalline or amorphous form, for instance in form of the hydrochloride, lactate, mesilate, p-tolyl sulphonate or other salts produced with physiologically well-tolerated acids as well as which contain interfacially active substances, as for instance lecithin in the form of soy bean lecithin, egg lecithin, brain lecithin or rape lecithin or other physiologically well-tolerated tensides in concentrations of 0.1 to 30%, particularly 0.2 to 10%, above all 0.5 to 5.0% W/V as well as which contain, in addition to the water-soluble active compound in the form of their salts, an excess of physiologically well-tolerated acids, as for instance lactic acid or citric acid in the range of 1 to 300 mmol/1, particularly 5 to 50 mmol/1, preferably 10 to 30 mmol/1. 
     Oily suspensions of quinolone-type gyrase inhibitors contain the active compound either in the form of the betaine or in the form of water-soluble salts. Physiologically well-tolerated acids appropriate for formation of salts are set forth hereinabove. 
     Oily suspensions can contain, as non-aqueous excipients, for example almond oil, arachis oil, olive oil, poppyseed oil, sesame oil, cottonseed oil, soya bean oil, corn oil, castor oil, ethyl oleate, oleyl oleate, isopropyl myristate, isopropyl palmitate, medium-chain triglycerides and others. Ethanol, glycerol, propylene glycol, polyethylene gLycoL, 1.3-butane diol, benzyl alcohol, diethylene glycol and triethylene glycol of various origins, polyoxyethylene-polyoxypropylene copolymers of the Pluronic® type, polyoxysorbitan fatty acid esters, sorbitan fatty acid esters monoolein, cremophor EL®, Inwitor 742® and different types of lecithin such as soy bean lecithin, egg lecithin, brain lecithin and rape lecithin can be used as further auxiliaries which can be combined with the substances mentioned. 
     Antioxidants which are used are α-, β-, γ- and δ-tocopherol, ascorbyl palmitate, ascorbyl stearate, L-cysteine, thiodipropionic acid, thiolactic acid, thioglycolic acid, monothioglycerol, propyl gallate, butylhydroxyanisole, butylhydroxytoluene and others. 
     If appropriate, a desired viscosity can be brought about by diluents such as ethanol or benzyl alcohol and by thickeners such as aluminum stearate. Acids such as those mentioned hereinabove may be added as absorption enhancers. Viscosity values for oily suspensions are 5-500 mPa.s, preferably 10-150 mPa.s. 
     Oily suspensions are prepared by combining the oily excipient with the auxiliaries contained therein and the active compound, which has been comminuted to the desired particle size, using suitable apparatuses (see above) and homogenizing the mixture. The particle sizes of 90% of the particles are 0.5-150 μm, preferably 4-12 μm. If final sterilization in the release vessel is prohibited because of a possible change in the particle size of the active compound, the suspension must again be prepared under aseptic conditions. Sterile filtration of the oily phase containing suitable auxiliaries in dissolved form is also indicated, such as antimicrobial pretreatment of the active compound, for example by heat treatment. Final sterilization in the form of a γ-ray sterilization may also be applied. 
     In addition to a finished suspension, a formulation which is to be freshly prepared shortly before administration can also be provided. In this case, the active compound must be homogeneously suspendable in the liquid excipient within a short time by shaking the vessel containing the formulation. 
     The invention also relates to suspension concentrates which are converted into the formulations according to the invention shortly before administration. 
     These concentrates can have various compositions. This invention relates to all the further combinations of concentrates and/or suspensions and solvents or solutions required for dilution which lead to the suspensions according to the invention. 
     This invention also relates to other presentation forms or combinations of presentation forms which in the end lead to the injection solutions according to the invention--regardless of the procedure. 
     The containers filled with suspensions, active compound, solvents and other presentation forms, such as suspension concentrates, can be made of glass or of plastic. The container materials here can contain substances which impart special protection to the contents, such as, for example, protection from light or protection from oxygen. In addition to small volume vessels, from which the suspension must be drawn into the injection syringe before administration, the vessels here can also be finished injection systems. 
     The injection formulations according to the invention are used in the therapeutic treatment of the human or animal body. 
     The formulations according to the invention have a low toxicity and exhibit a broad antibacterial spectrum against Gram-positive and Gram-negative germs, in particular against Enterobacteriaceae; above all also against those which are resistant towards various antibiotics, such as, for example, penicillins, cephalosporins, aminoglycosides, sulphonamides and tetracyclines. 
     The formulations according to the invention are active against a very broad spectrum of microorganisms. Gram-negative and Gram-positive bacteria and bacteria-like microorganisms can be combated and the diseases caused by these pathogens can be prevented, alleviated and/or cured with the aid of these formulations. 
     The formulations according to the invention are particularly active against bacteria and bacteria-like microorganisms. They are therefore particularly suitable for the prophylaxis and chemotherapy, in human and veterinary medicine, of local and systemic infections caused by these pathogens. 
     For example, it is possible to treat and/or prevent local and/or systemic diseases caused by the following pathogens or by mixtures of the following pathogens: Gram-positive cocci, for example Staphylococci (Staph. aureus and Staph. epidermidis) and Streptococci (Strept. agalactiae, Strept. faecalis, Strept. pneumoniae and Strept. pyogenes); Gram-negative cocci (Neisseria gonorrhoeae) and Gram-negative rod-shaped bacilli, such as Enterobacteriaceae, for example Escherichia coli, Haemophilus influenzae, Citrobacter (Citrob. freundii and Citrob. divernis), Salmonella and Shigella; and furthermore Klebsiellae (Klebs. pneumoniae, Klebs. oxytoca), Enterobacter (Ent. aerogenes and Ent. agglomerans), Hafnia, Serratia (Serr. marcescens), Proteus (Pr. mirabilis, Pr. rettgeri and Pr. vulgaris), Providencia and Yersinia, and the genus Acinetobacter. The antibacterial spectrum moreover includes the genus Pseudomonas (Ps. aeruginosa and Ps. maltophilia) and strictly anaerobic bacteria, such as, for example, Bacteroides fragilis, representatives of the genus Peptococcus and Peptostreptococcus and the genus Clostridium; and furthermore Mykoplasma (M. pneumoniae, M. hominis and M. urealyticum) and Mycobacteria, for example Mycobacterium tuberculosis. 
     The above list of pathogens is to be interpreted merely by way of example and in no way as limiting. Examples which may be mentioned of diseases which can be caused by the pathogens or mixed infections mentioned and can be prevented, alleviated or cured by the compounds according to the invention are: infection diseases in humans, such as, for example, otitis, pharyngitis, pneumonia, peritonitis, pyelonephritis, cystitis, endocarditis, systemic infections, bronchitis (acute and chronic), septic infections, diseases of the upper respiratory tract, diffuse panbronchiolitis, pulmonary emphysema, dysentery, enteritis, liver abscesses, urethritis, prostatitis, epididymitis, gastrointestinal infections, bone and joint infections, cystic fibrosis, skin infections, postoperative wound infections, abscesses, phlegmons, wound infections, infected burns, burn wounds, infections in the oral region, infections following dental operations, osteomyelitis, septic arthritis, cholecystitis, peritonitis with appendicitis, cholangitis, intraabdominal abscesses, pancreatitis, sinusitis, mastoiditis, mastitis, tonsillitis, typhoid, meningitis and infections of the nervous system, salpingitis, endometritis, genital infections, pelveoperitonitis and eye infections. 
     Bacterial infections can also be treated in other species as well as in humans. Examples which may be mentioned are: 
     pigs: colidiarrhoea, enterotoxaemia, sepsis, dysentery, salmonellosis, mastitis-metritis agalactia syndrome and mastitis; 
     ruminants (cattle, sheep, goats): diarrhoea, sepsis, bronchopneumonia, salmonellosis, pasteurellosis, mycoplasmosis and genital infections; 
     horses: bronchopneumonia, joint ill, puerperal and postpuerperal infections and salmonellosis; 
     dogs and cats: bronchopneumonia, diarrhoea, dermatitis, otitis, urinary tract infections and prostatitis; poultry (chickens, turkeys, quails, pigeons, ornamental birds and others): mycoplasmosis, E. coli infections, chronic diseases of the respiratory tract, salmonellosis, pasteurellosis and psittacosis. 
     Bacterial diseases can also be treated in the rearing and keeping of stock and ornamental fish, the antibacterial spectrum extending beyond the abovementioned pathogens to further pathogens, such as, for example, Pasteurella, Brucella, Campylobacter, Listeria, Erysipelothrix, Corynebacteria, Borrelia, Treponema, Nocardia, Rickettsia and Yersinia. 
     The auxiliaries mentioned in the examples are commercially available and are defined in part in H. P. Fiedler, Lexikon der Hilfsstoffe fur Pharmazie, Kosmetik und angrenzende Gebiete (Dictionary of Auxiliaries for Pharmacy, Cosmetics and Related Areas), Editio Cantor KG - Aulendorf i. Wurtt. 1971 (for example Tween® and Miglyol®). 
     The invention will be further described with reference to the accompanying drawings relating to comparison experiments which demonstrate the good tolerability of a ciprofloxacin intramuscular suspension in contrast to ciprofloxacin intramuscular solutions. 
    
    
     FIG. 1 shows the course of the creatinine kinase following intramuscular administration of ciprofloxacin intramuscular solutions, an intramuscular suspension and comparison solutions. 
     FIG. 2 shows the local irritation following intramuscular administration of ciprofloxacin solutions and a ciprofloxacin intramuscular suspension and comparison solutions. 
     FIG. 3 shows the blood plasma levels after application of an oily ciprofloxacin-HCl suspension to rabbits. 
    
    
     The very fast absorption of Ciprofloxacin-HCl from an oily suspension into the blood is clearly evident. 
     Results 
     1) The local irritations following intramuscular administration of 5% weight/volume ciprofloxacin suspensions are clearly less than those caused by intramuscular solutions (Rabbit test) 
     2) In contrast to the intramuscular solutions tested, administration of the ciprofloxacin suspension causes no increase in the serum creatinine kinase. 
     The formulations used for the experiments are described below (rabbit test). 
     
         ______________________________________                                    
Ciprofloxacin intramuscular injection solution                            
5% w/v                                                                    
Ciprofloxacin         50.0       g                                        
Lactic acid saponified 20%                                                
                      131.0      g                                        
Water for injection purposes                                              
                      840.6      g                                        
                      1021.6     g                                        
clear yellowish solution; pH 3.9, isotonic                                
Ciprofloxacin intramuscular injection solution                            
5% weight/volume 2 ml                                                     
B                                                                         
Ciprofloxacin         50.0       g                                        
100% strength acetic acid                                                 
                      25.0       g                                        
Water for injection purposes                                              
                      943.7      g                                        
                      1,018.7    g (1 l)                                  
clear, yellow solution; pH 4.2                                            
Ciprofloxacin intramuscular injection solution                            
5% weight/volume 2 ml                                                     
C                                                                         
Ciprofloxacin         50.0       g                                        
Methanesulphonic acid 14.5       g                                        
Anhydrous glycerol    12.5       g                                        
0.1 N NaOH solution   to pH 4.2                                           
Water for injection purposes                                              
                      945.5      g                                        
                      1,022.5    g (1 l)                                  
Clear, yellow solution; pH 4.2                                            
Ciprofloxacin intramuscular suspension                                    
5% weight/volume 2 ml                                                     
D                                                                         
Ciprofloxacin         50.0       g                                        
20% weight/weight NaOH solution                                           
                      55.2       g                                        
Citric acid fine grit 17.9       g                                        
Tylopur C 300 P       2.0        g                                        
Water for injection purposes                                              
                      907.3      g                                        
                      1,032.4    g (1 1)                                  
Sedimenting, reshakable suspensions of pH 7; particle                     
size of the crystals predominantly less than 10 μm.                    
Ciprofloxacin suspension 5% w/v                                           
 E                                                                        
Ciprofloxacin-HCl     58.2       g                                        
Phospholipon 100      5.0        g                                        
Benzyl alcohol distilled                                                  
                      20.0       g                                        
Miglyol 812 ®     883.8      g                                        
                      967.0      g                                        
white oily suspension;                                                    
Ciprofloxacin placebo                                                     
F                                                                         
Lactic acid saponified 20%                                                
                      64.06      g                                        
2 N NaOH - solution   38.4       g                                        
Sodium chloride       1.46       g                                        
Water for injection purposes                                              
                      900.08     g                                        
                      1004.0     g                                        
clear colorless solution isotonic; pH 3.9                                 
Ciprofloxacin placebo                                                     
Ciprofloxacin intramuscular injection solution placebo                    
5% weight/volume 2 ml                                                     
G                                                                         
100% strength acetic acid                                                 
                      50.0       g                                        
1 N NaOH solution     to pH 4.2                                           
Water for injection purposes                                              
                      956.7      g                                        
                      1,006.7    g                                        
Clear, colorless solution; pH about 4.2                                   
Ciprofloxacin placebo                                                     
Ciprofloxacin intramuscular injection solution placebo                    
5% weight/volume 2 ml                                                     
H                                                                         
Methanesulphonic acid 14.5       g                                        
Anhydrous glycerol    12.5       g                                        
1 N NaOH solution     about 158.06                                        
                                 g                                        
Water for injection purposes                                              
                      825.54     g                                        
                      1,010.6    g                                        
Clear, almost colorless solution;                                         
pH about 4.2                                                              
Osmolality about 425 m osmol                                              
Ciprofloxacin placebo                                                     
Ciprofloxacin intramuscular injection solution placebo                    
5% weight/volume 2 ml                                                     
J                                                                         
Citric acid fine grit 17.9       g                                        
20% weight/weight NaOH solution                                           
                      55.6       g                                        
Tylopur C 300 P ® 2.0        g                                        
Water for injection purposes                                              
                      940.3      g                                        
                      1,015.8    g (1 l)                                  
Colorless, slightly opalescent solution; pH 6.8                           
______________________________________                                    
Examples                                                                  
______________________________________                                    
Ciprofloxacin     50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  --                                                      
Water             909.3    g     pH = 6.5                                 
Ciprofloxacin     50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  2.0      g                                              
Water             907.3    g     pH = 6.7                                 
Ciprofloxacin     50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  5.0      g                                              
Water             904.3    g     pH = 6.5                                 
Ciprofloxacin     50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  7.5      g                                              
Water             901.8    g     pH = 6.5                                 
Ciprofloxacin     50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  7.5      g                                              
Water             899.5    g     pH = 6.5                                 
Ciprofloxacin     50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       16.0     g                                              
Tylopur C 300 P ®                                                     
                  2.0      g                                              
Water             909.2    g     pH = 7.9                                 
Ciprofloxacin     50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       24.7     g                                              
Tylopur C 300 P ®                                                     
                  2.0      g                                              
Water             900.5    g     pH = 5.3                                 
Ciprofloxacin     50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  2.0      g                                              
Tween 20          2.0      g                                              
Water             900.5    g     pH = 6.9                                 
Ciprofloxacin     5.0      g     preparation by                           
20% weight/weight NaOH                                                    
                  9.43     g     precipitation                            
solution                                                                  
Lipoid E 80       0.2      g                                              
Citric acid       1.8      g                                              
Tylopur C 300 P ®                                                     
                  0.2      g                                              
Water             77.17    g                                              
10.                                                                       
Ciprofloxacin     50.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Methanesulphonic acid                                                     
                  16.15    g                                              
10% weight/weight NaOH                                                    
                  18.83    ml                                             
solution                                                                  
Water             400.8    g     pH = 7.0                                 
Ciprofloxacin     50.0     g     preparation by                           
Methanesulphonic acid                                                     
                  16.15    g     precipitation                            
L-Arginine        6.113    g                                              
Water             407.33   g     pH = 7.0                                 
Ciprofloxacin     50.0     g     preparation by                           
Methanesulphonic acid                                                     
                  16.15    g     precipitation                            
Trimethanol (tris)                                                        
                  4.41     g                                              
Water             408.37   g     pH = 7.0                                 
Micronized ciprofloxacin hydrate                                          
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     ciprofloxacin                            
Anhydrous glycerol                                                        
                  2.5      g     hydrate in the                           
Water             to 100   ml    aqueous phase                            
Micronized ciprofloxacin hydrate                                          
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     ciprofloxacin                            
Anhydrous glycerol                                                        
                  2.5      g     hydrate in the                           
Water             to 100   ml    aqueous phase                            
Micronized ciprofloxacin hydrate                                          
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.75     g     ciprofloxacin                            
Tween 80 ®    0.2      g     hydrate in the                           
Anhydrous glycerol                                                        
                  2.5      g     aqueous phase                            
Water             to 100   ml    pH 6.8                                   
Micronized ciprofloxacin hydrate                                          
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.75     g     ciprofloxacin                            
Lipoid E 80 ® 0.2      g     hydrate in the                           
Anhydrous glycerol                                                        
                  2.5      g     aqueous phase                            
Water             to 1,000 ml    pH 6.8                                   
Micronized ciprofloxacin hydrate                                          
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     ciprofloxacin                            
Tween 80 ®    0.2      g     hydrate in the                           
Anhydrous glycerol                                                        
                  2.5      g     aqueous phase                            
Water             to 100   ml    pH 6.8                                   
Micronized ciprofloxacin hydrate                                          
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     ciprofloxacin                            
Lipoid E 80 ® 0.2      g     hydrate in the                           
Anhydrous glycerol                                                        
                  2.5      g     aqueous phase                            
Water             to 1,000 ml    pH 6.8                                   
Ciprofloxacin hydrate                                                     
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     ciprofloxacin                            
Lipoid E 80       0.2      g     hydrate in the                           
                                 aqueous phase                            
Water             90.0     ml    pH 7                                     
20.                                                                       
Ciprofloxacin hydrate                                                     
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     ciprofloxacin                            
Citrate buffer    90.0     g     hydrate in the                           
solution pH 7                    aqueous phase                            
Lipoid E 80       0.2      g     pH 7                                     
Ciprofloxacin hydrate                                                     
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     ciprofloxacin                            
Phosphate buffer  90.0     g     hydrate in the                           
solution pH 7                    aqueous phase                            
Lipoid E 80       0.2      ml    pH 7                                     
Ciprofloxacin     5.0      g     preparation of                           
20% weight/weight NaOH                                                    
                  3.27     g     precipitation                            
solution                                                                  
85% strength H.sub.3 PO.sub.4 solution                                    
                  1.07     g                                              
Tylopur C 300 P ®                                                     
                  0.2      g                                              
Water             93.14    g                                              
Ciprofloxacin     50.0     g     pH/                                      
20% weight/weight NaOH                                                    
                  55.57    g     osmolality:                              
solution                         285 m osmol/kg                           
Citric acid fine grit                                                     
                  17.9     g                                              
Water             903.6    g                                              
Particle size &lt;10 μm                                                   
Precipitation under aseptic conditions via a reaction                     
jet 60/40 bar and high pressure homogenization under 400 bar.             
Ciprofloxacin     100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Water             869.2    g     pH 7.0                                   
Particle size &lt;2-5 μm (90% less than 10 μm)                         
Precipitation under aseptic conditions via a reaction                     
jet 60/40 bar and high pressure homogenization under 400 bar.             
Ciprofloxacin     100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Tween 80 ®    0.1      g                                              
Water             869.2    g     pH 7.0                                   
Ciprofloxacin     100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Tween 80 ®    1.0      g                                              
Water             868.2    g     pH 7.0                                   
Ciprofloxacin     100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Tween 80 ®    2.0      g                                              
Water             867.1    g     pH 7.0                                   
Ciprofloxacin     100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Tween 80 ®    2.0      g                                              
Water             867.1    g     pH 7.0                                   
Ciprofloxacin     40.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  24.8     g     precipitation                            
solution                                                                  
Citric acid fine grit                                                     
                  7.92     g                                              
Lipoid E 75 ® 4.0      g                                              
Water             343.6    g     pH 7.0                                   
30.                                                                       
Ciprofloxacin     200.0    g     preparation by                           
20% weight/weight NaOH                                                    
                  62.8     g     precipitation                            
solution                                                                  
Citric acid fine grit                                                     
                  41.88    g                                              
Water             738.27   g     pH 7.05                                  
Ciprofloxacin     20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.38    ml                                             
solution                                                                  
Water             to 100   ml    pH 7.05                                  
Ciprofloxacin     15.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  9.3      g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  16.05    ml                                             
solution                                                                  
Water             to 100   ml                                             
Ciprofloxacin     25.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  11.25    g     precipitation                            
solution                                                                  
20% weight/weight lactic acid                                             
                  3.72     g                                              
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.5     ml                                             
solution                                                                  
Water             to 100   ml    pH 7.0                                   
Ciprofloxacin     20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  10.0     g     precipitation                            
solution                                                                  
20% weight/weight lactic acid                                             
                  7.44     g                                              
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  12.0     ml                                             
solution                                                                  
Water             to 100   ml    pH 7.0                                   
Ciprofloxacin     20.0     g      preparation by                          
20% weight/weight NaOH                                                    
                  8.75     g     precipitation                            
solution                                                                  
20% weight/weight lactic acid                                             
                  11.16    g                                              
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  6.7      ml                                             
solution                                                                  
Water             to 100   ml    pH 7.0                                   
Ciprofloxacin     20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.1     ml                                             
solution                                                                  
Tylopur C 300 P ®                                                     
                  0.05     g                                              
Water             to 100   ml    pH 7.0                                   
Ciprofloxacin     20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.1     ml                                             
solution                                                                  
HPC               0.05     g                                              
Water             to 100   ml    pH 7.0                                   
Ciprofloxacin     20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.1     ml                                             
solution                                                                  
Tween 80 ®    0.05     g                                              
Water             to 100   ml    pH 7.0                                   
Ciprofloxacin     20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.1     ml                                             
solution                                                                  
Tween 80 ®    1.0      g                                              
Water             to 100   ml    pH 7.0                                   
40.                                                                       
Ciprofloxacin     5        g     Suspension of                            
hydrochloride                    ciprofloxacin                            
Ethyl oleate      50       g     hydrochloride                            
Ciprofloxacin hydrochloride                                               
                  10       g                                              
Ethyl oleate      50       g                                              
Ciprofloxacin hydrochloride                                               
                  30       g                                              
Ethyl oleate      50       g                                              
Ciprofloxacin hydrochloride                                               
                  25       g                                              
Ethyl oleate      50       g                                              
Ciprofloxacin hydrochloride                                               
                  5        g                                              
Miglyol 812 ® 50       g                                              
Ciprofloxacin hydrochloride                                               
                  10       g                                              
Miglyol 812 ® 50       g                                              
Ciprofloxacin hydrochloride                                               
                  15       g                                              
Miglyol 812 ® 50       g                                              
Ciprofloxacin hydrochloride                                               
                  5        g                                              
Peanut oil        50       g                                              
Ciprofloxacin hydrochloride                                               
                  5        g                                              
Ethyl oleate/Phospholipon                                                 
                  50       g                                              
100 ® = 99.5/0.5                                                      
Ciprofloxacin hydrochloride                                               
                  30       g                                              
Ethyl oleate/Phospholipon                                                 
                  50       g                                              
100 ® = 99.5/0.5                                                      
50.                                                                       
Ciprofloxacin hydrochloride                                               
                  10       g                                              
Miglyol 812 ®/Phospholipon                                            
                  50       g                                              
100 ® = 99.5/0.5                                                      
Ciprofloxacin hydrochloride                                               
                  15       g                                              
Miglyol 812 ®/Phospholipon                                            
                  50       g                                              
100 ® = 99.5/0.5                                                      
Ciprofloxacin     30       g                                              
Ethyl oleat ® 50       g                                              
Ciprofloxacin     10       g                                              
Miglyol 812 ® 50       g                                              
Ciprofloxacin     2.5      g                                              
Peanut oil        50       g                                              
Ciprofloxacin hydrochloride                                               
                  30       g                                              
Ethyl oleate      50       g                                              
Ascorbyl palmitate                                                        
                  0.1      g                                              
Lecithin (Phospholipon 100) ®                                         
                  0.5      g                                              
Ciprofloxacin hydrochloride                                               
                  25       g                                              
Miglyol 812 ® 50       g                                              
Ascorbyl palmitate                                                        
                  0.1      g                                              
Lecithin (Phospholipon 100) ®                                         
                  0.5      g                                              
Ciprofloxacin hydrochloride                                               
                  30       g                                              
Ethyl oleate      50       g                                              
Ascorbyl palmitate                                                        
                  0.1      g                                              
Lecithin (Phospholipon 100) ®                                         
                  0.5      g                                              
Benzyl alcohol    3        g                                              
Ciprofloxacin hydrochloride                                               
                  25       g                                              
Miglyol 812 ® 50       g                                              
Benzyl alcohol    3        g                                              
Lecithin (Phospholipon 100) ®                                         
                  0.5      g                                              
Ascorbyl palmitate                                                        
                  0.1      g                                              
Norfloxacin       50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
60.                                                                       
Norfloxacin       50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P  ®                                                    
                  2.0      g                                              
Water             907.3    g     pH = 6.7                                 
Norfloxacin       50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  5.0      g                                              
Water             904.3    g     pH = 6.5                                 
Ofloxacin         50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  7.5      g                                              
Water             901.8    g     pH = 6.5                                 
Ofloxacin         50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  7.5      g                                              
Water             899.5    g     pH = 6.5                                 
Ofloxacin         50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       16.0     g                                              
Tylopur C 300 P ®                                                     
                  2.0      g                                              
Water             909.2    g     pH = 7.8                                 
Ofloxacin         50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       24.7     g                                              
Tylopur C 300 P ®                                                     
                  2.0      g                                              
Water             900.5    g     pH =  5.3                                
Norfloxacin       50       g     preparation by                           
20% weight/weight NaOH                                                    
                  55.2     g     precipitation                            
solution                                                                  
Citric acid       17.9     g                                              
Tylopur C 300 P ®                                                     
                  2.0      g                                              
Tween 20 ®    2.0      g                                              
Water             900.5    g     pH = 6.9                                 
Ofloxacin         5.0      g     preparation by                           
20% weight/weight NaOH                                                    
                  9.43     g     precipitation                            
solution                                                                  
Lipoid E 80 ® 0.2      g                                              
Citric acid       1.8      g                                              
Tylopur C 300 P ®                                                     
                  0.2      g                                              
Water             77.17    g                                              
Pefloxacin        50.0     g     preparation by                           
Methanesulphonic acid                                                     
                  16.15    g     precipitation                            
10% weight/weight NaOH                                                    
                  10.83    ml                                             
solution                                                                  
Water             400.8    g     pH = 7.0                                 
Norfloxacin       50.0     g     preparation by                           
Methanesulphonic acid                                                     
                  16.15    g     precipitation                            
L-Arginine        6.11     g                                              
Water             407.33   g                                              
70.                                                                       
Norfloxacin       50.0     g     preparation by                           
Methanesulphonic acid                                                     
                  16.15    g     precipitation                            
Trimethanol (tris)                                                        
                  4.41     g                                              
Water             408.3    g     pH = 7.0                                 
Micronized norfloxacin hydrate                                            
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     norfloxacin                              
Anhydrous glycerol                                                        
                  2.5      g     hydrate in the                           
Water             to 100   ml    aqueous phase                            
Micronized ofloxacin hydrate                                              
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.75     g     norfloxacin                              
Anhydrous glycerol                                                        
                  2.5      g     hydrate in the                           
Water             to 100   ml    aqueous phase                            
Micronized amifloxacin hydrate                                            
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.75     g     norfloxacin                              
Tween 80 ®    0.2      g     hydrate in the                           
Anhydrous glycerol                                                        
                  2.5      g     aqueous phase                            
Water             to 100   ml    pH 6.8                                   
Micronized pefloxacin hydrate                                             
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.75     g     norfloxacin                              
Lipoid E 80 ® 0.2      g     hydrate in the                           
Anhydrous glycerol                                                        
                  2.5      g     aqueous phase                            
Water             to 100   ml    pH 6.8                                   
Micronized enrofloxacin hydrate                                           
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     enrofloxacin                             
Tween 80 ®    0.2      g     hydrate in the                           
Anhydrous glycerol                                                        
                  2.5      g     aqueous phase                            
Water             to 100   ml    pH 6.8                                   
Micronized enrofloxacin hydrate                                           
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     enrofloxacin                             
Lipoid 80 ®   0.2      g     hydrate in the                           
Anhydrous glycerol                                                        
                  2.5      g     aqueous phase                            
Water             to 100   ml    pH 6.8                                   
Enrofloxacin hydrate                                                      
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     enrofloxacin                             
Lipoid E 80 ® 0.2      g     hydrate in the                           
                                 aqueous phase                            
Water             90.0     ml    pH 7                                     
Enrofloxacin hydrate                                                      
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     enrofloxacin                             
Citrate buffer solution pH 7                                              
                  90.0     g     hydrate in the                           
                                 aqueous phase                            
Lipoid E 80 ® 0.2      g     pH 7                                     
Enrofloxacin hydrate                                                      
                  5.85     g     Suspension of                            
(85.5%)                          micronized                               
Tylopur C 300 P ®                                                     
                  0.2      g     enrofloxacin                             
Phosphate buffer solution pH 7                                            
                  90.0     g     hydrate in the                           
                                 aqueous phase                            
Lipoid E 80 ® 0.2      ml    pH 7                                     
80.                                                                       
Active compound A 5.0      g     preparation by                           
20% weight/weight NaOH                                                    
                  2.27     g     precipitation                            
solution                                                                  
85% H.sub.3 PO solution                                                   
                  1.07     g                                              
Tylopur C 300 P ®                                                     
                  0.2      g                                              
Water             93.14    g                                              
Active compound B 50.0     g     pH 7                                     
20% weight/weight NaOH                                                    
                  55.5     g     pH 7                                     
solution                         osmolality:                              
                                 285 m osmol/kg                           
Citric acid fine grit                                                     
                  17.9     g                                              
Water             903.6    g                                              
Particle size &lt;10 μm                                                   
Precipitation under aseptic conditions via a reaction                     
jet 60/40 bar and high pressure homogenization under 400 bar.             
Active compound C 100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Water             869.2    g                                              
Particle size     2-5      lm    (90% under                               
                                 10 μm)                                
Precipitation under aseptic conditions via a reaction                     
jet 60/40 bar and high pressure homogenization under 400 bar.             
Active compound A 100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Tween 80 ®    0.1      g                                              
Water             869.2    g     pH 7.0                                   
Active compound B 100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Tween 80 ®    1.0      g                                              
Water             868.2    g     pH 7.0                                   
Active compound B 100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Tween 80 ®    2.0      g                                              
Water             867.1    g     pH 7.0                                   
Active compound A 100.0    g                                              
20% weight/weight NaOH                                                    
                  62.0     g                                              
solution                                                                  
Citric acid fine grit                                                     
                  19.8     g                                              
Tween 80 ®    2.0      g                                              
Water             867.1    g     pH 7.0                                   
Active compound B 40.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  24.8     g     precipitation                            
solution                                                                  
Citric acid fine grit                                                     
                  7.92     g                                              
Lipoid E 75 ® 4.0      g                                              
Water             343.6    g     pH 7.0                                   
Active compound B 200.0    g     preparation by                           
20% weight/weight NaOH                                                    
                  62.8     g     precipitation                            
solution                                                                  
Citric acid fine grit                                                     
                  41.88    g                                              
Water             738.27   g     pH 7.05                                  
Active compound C 20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO                                              
                  21.38    ml                                             
solution                                                                  
Water             to 100   ml    pH 7.05                                  
90.                                                                       
Active compound B 15.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO                                              
                  16.05    ml                                             
solution                                                                  
Water             to 100   ml                                             
Active compound A 20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  11.25    g     precipitation                            
solution                                                                  
20% weight/weight lactic acid                                             
                  3.72     g                                              
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.5     ml                                             
solution                                                                  
Water             to 100   ml    pH 7.0                                   
Active compound B 20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  10.0     g     precipitation                            
solution                                                                  
20% weight/weight lactic acid                                             
                  7.44     g                                              
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  12.0     ml                                             
solution                                                                  
Water             to 100   ml    pH 7.0                                   
Active compound B 20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  8.75     g     precipitation                            
solution                                                                  
20% weight/weight lactic acid                                             
                  11.16    g                                              
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  6.7      ml                                             
solution                                                                  
Water             to 100   ml    pH 7.0                                   
Active compound C 20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
20% weight/weight lactic acid                                             
                  21.1     ml                                             
solution                                                                  
Tylopur C 300 P ®                                                     
                  0.05     g                                              
Water             to 100   ml    pH 7.0                                   
Active compound C 20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.1     ml                                             
solution                                                                  
HPC               0.05     g                                              
Water             to 100   ml    pH 7.0                                   
Active compound B 20       g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.1     ml                                             
solution                                                                  
Tween 80 ®    0.05     g                                              
Water             to 100   ml    pH 7.0                                   
Active compound C 20.0     g     preparation by                           
20% weight/weight NaOH                                                    
                  12.4     g     precipitation                            
solution                                                                  
15% weight/weight H.sub.3 PO.sub.4                                        
                  21.1     ml                                             
solution                                                                  
Tween 80 ®    1.0      g                                              
Water             to 100   ml    pH 7.0                                   
Norfloxacin       5        g     suspension of                            
                                 norfloxacin in                           
                                 oily excipient                           
Ofloxacin         10       g                                              
Ethyl oleate      50       g                                              
100.                                                                      
Norfloxacin       30       g                                              
Ethyl oleate      50       g                                              
101.                                                                      
Norfloxacin       25       g                                              
Ethyl oleate      50       g                                              
102.                                                                      
Ofloxacin         5        g                                              
Miglyol 812 ® 50       g                                              
103.                                                                      
Pefloxacin        10       g                                              
Miglyol 812 ® 50       g                                              
104.                                                                      
Active compound A 15       g                                              
Miglyol 812 ® 50       g                                              
105.                                                                      
Active compound   5        g                                              
Peanut oil        50       g                                              
106.                                                                      
Active compound B 5        g                                              
Ethyl oleate/phospholipon                                                 
                  50       g                                              
100 ® = 99.5/0.5                                                      
107.                                                                      
Active compound C 30       g                                              
Ethyl oleate/phospholipon                                                 
                  50       g                                              
100 ® = 99.5/0.5                                                      
108.                                                                      
Active compound B 10       g                                              
Miglyol 812 ®/phospholipon                                            
                  50       g                                              
100 ® = 99.5/0.5                                                      
109.                                                                      
Active compound A 15       g                                              
Miglyol 812 ®/phospholipon                                            
                  50       g                                              
100 ® = 99.5/0.5                                                      
110.                                                                      
Active compound C 30       g                                              
Ethyl oleate      50       g                                              
111.                                                                      
Active compound A 10       g                                              
Miglyol 812 ® 50       g                                              
112.                                                                      
Active compound B 2.5      g                                              
Peanut oil        50       g                                              
113.                                                                      
Active compound B 30       g                                              
Ethyl oleate      50       g                                              
Ascorbyl palmitate                                                        
                  0.1      g                                              
Lecithin (Phospholipon 100 ®)                                         
                  0.5      g                                              
114.                                                                      
Active compound C 25       g                                              
Miglyol 812 ® 50       g                                              
Ascorbyl palmitate                                                        
                  0.1      g                                              
Lecithin (Phospholipon 100 ®)                                         
                  0.5      g                                              
115.                                                                      
Active compound B 30       g                                              
Ethyl oleate      50       g                                              
Ascorbyl palmitate                                                        
                  0.1      g                                              
Lecithin (Phospholipon 100 ®)                                         
                  0.5      g                                              
Benzyl alcohol    3        g                                              
116.                                                                      
Active compound C 25       g                                              
Miglyol 812 ® 50       g                                              
Benzyl alcohol    3        g                                              
Lecithin (Phospholipon 100 ®)                                         
                  0.5      g                                              
Ascorbyl palmitate                                                        
                  0.1      g                                              
117.                                                                      
Ciprofloxacin hydrochloride                                               
                  5.8      g                                              
Benzyl alcohol    2.0      g                                              
Soy bean lecithin purified                                                
                  0.5      g                                              
Medium chain triglycerides                                                
                  ad 100.0 ml                                             
DAB9                                                                      
118.                                                                      
Ciprofloxacin hydrochloride                                               
                  11.6     g                                              
Benzyl alcohol    2.0      g                                              
Egg lecithin purified                                                     
                  0.5      g                                              
Medium chain triglycerides                                                
                  ad 100.0 ml                                             
DAB9                                                                      
119.                                                                      
Ciprofloxacin hydrochloride                                               
                  11.6     g                                              
Benzyl alcohol    2.0      g                                              
Soy bean lecithin purified                                                
                  5.0      g                                              
Miglyol 812 ® ad 100.0 ml                                             
120.                                                                      
Ciprofloxacin hydrochloride                                               
                  11.6     g                                              
Ethanol absolute  5.0      g                                              
Egg lecithin purified                                                     
                  5.0      g                                              
Medium chain triglycerides                                                
                  ad 100.0 ml                                             
DAB9                                                                      
121.                                                                      
Ciprofloxacin hydrochloride                                               
                  11.6     g                                              
Ethanol absolute  5.0      g                                              
Soy bean lecithin purified                                                
                  5.0      g                                              
Lactic acid concentrated                                                  
                  0.05-1.0 g                                              
Miglyol 812 ® ad 100   ml                                             
122.                                                                      
Ciprofloxacin lactate                                                     
                  12.7     g                                              
Benzyl alcohol    2.0      g                                              
Soy bean lecithin purified                                                
                  5.0      g                                              
Medium chain triglycerides                                                
                  ad 100.0 ml                                             
123.                                                                      
Ciprofloxacin mesilate                                                    
                  13.42    g                                              
Ethanol           10.0     g                                              
Egg lecithin purified                                                     
                  10.0     g                                              
Ethyl oleate      ad 100.0 ml                                             
124.                                                                      
Ciprofloxacin lactate                                                     
                  12.7     g                                              
Ethanol           5.0      g                                              
Soy bean lecithin purified                                                
                  5.0      g                                              
Lactic acid concentrate                                                   
                  0.05-1.0 g                                              
Miglyol 812 ® ad 100.0 ml                                             
125.                                                                      
Ciprofloxacin hydrochloride                                               
                  11.6     g                                              
Ethanol           10.0     g                                              
Soy bean lecithin purified                                                
                  5.0      g                                              
Methane sulphonic acid                                                    
                  0.05-1.0 g                                              
Miglyol 812 ® ad 100.0 ml                                             
126.                                                                      
Ciprofloxacin hydrochloride                                               
                  11.6     g                                              
Ethanol           5.0      g                                              
Soy bean lecithin purified                                                
                  5.0      g                                              
Citric acid anhydrous micronized                                          
                  0.05-2.0 g                                              
Miglyol 812 ® ad 100.0 ml                                             
______________________________________                                    
 
    
     It will be appreciated that the instant specification and claims are set forth by way of illustration and not limitation, and that various modifications and changes may be made without departing from the spirit and scope of the present invention.